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684db121 |
1 | package Mouse::Meta::TypeConstraint; |
bc69ee88 |
2 | use Mouse::Util qw(:meta); # enables strict and warnings |
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3 | |
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4 | use overload |
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5 | '""' => sub { $_[0]->name }, # stringify to tc name |
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6 | fallback => 1; |
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7 | |
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8 | use Carp (); |
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9 | |
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10 | my $null_check = sub { 1 }; |
11 | |
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12 | sub new { |
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13 | my($class, %args) = @_; |
14 | |
15 | $args{name} = '__ANON__' if !defined $args{name}; |
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16 | |
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17 | my $check = delete $args{optimized}; |
18 | |
19 | if($args{_compiled_type_constraint}){ |
0126c27c |
20 | Carp::cluck("'_compiled_type_constraint' has been deprecated, use 'optimized' instead") |
21 | if _MOUSE_VERBOSE; |
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22 | |
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23 | $check = $args{_compiled_type_constraint}; |
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24 | } |
25 | |
26 | if($check){ |
27 | $args{hand_optimized_type_constraint} = $check; |
28 | $args{compiled_type_constraint} = $check; |
29 | } |
30 | |
31 | $check = $args{constraint}; |
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32 | |
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33 | if(defined($check) && ref($check) ne 'CODE'){ |
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34 | Carp::confess("Constraint for $args{name} is not a CODE reference"); |
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35 | } |
36 | |
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37 | $args{package_defined_in} ||= caller; |
38 | |
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39 | my $self = bless \%args, $class; |
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40 | $self->compile_type_constraint() if !$self->{hand_optimized_type_constraint}; |
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41 | |
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42 | if($self->{type_constraints}){ # Union |
43 | my @coercions; |
44 | foreach my $type(@{$self->{type_constraints}}){ |
45 | if($type->has_coercion){ |
46 | push @coercions, $type; |
47 | } |
48 | } |
49 | if(@coercions){ |
50 | $self->{_compiled_type_coercion} = sub { |
51 | my($thing) = @_; |
52 | foreach my $type(@coercions){ |
53 | my $value = $type->coerce($thing); |
54 | return $value if $self->check($value); |
55 | } |
56 | return $thing; |
57 | }; |
58 | } |
59 | } |
60 | |
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61 | return $self; |
62 | } |
63 | |
64 | sub create_child_type{ |
65 | my $self = shift; |
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66 | # XXX: FIXME |
67 | return ref($self)->new( |
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68 | # a child inherits its parent's attributes |
69 | %{$self}, |
70 | |
71 | # but does not inherit 'compiled_type_constraint' and 'hand_optimized_type_constraint' |
72 | compiled_type_constraint => undef, |
73 | hand_optimized_type_constraint => undef, |
74 | |
75 | # and is given child-specific args, of course. |
76 | @_, |
77 | |
78 | # and its parent |
79 | parent => $self, |
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80 | ); |
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81 | } |
82 | |
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83 | |
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84 | sub compile_type_constraint{ |
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85 | my($self) = @_; |
86 | |
87 | # add parents first |
88 | my @checks; |
89 | for(my $parent = $self->parent; defined $parent; $parent = $parent->parent){ |
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90 | if($parent->{hand_optimized_type_constraint}){ |
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91 | unshift @checks, $parent->{hand_optimized_type_constraint}; |
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92 | last; # a hand optimized constraint must include all the parents |
93 | } |
94 | elsif($parent->{constraint}){ |
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95 | unshift @checks, $parent->{constraint}; |
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96 | } |
97 | } |
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98 | |
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99 | # then add child |
100 | if($self->{constraint}){ |
101 | push @checks, $self->{constraint}; |
102 | } |
103 | |
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104 | if($self->{type_constraints}){ # Union |
105 | my @types = map{ $_->_compiled_type_constraint } @{ $self->{type_constraints} }; |
106 | push @checks, sub{ |
107 | foreach my $c(@types){ |
108 | return 1 if $c->($_[0]); |
109 | } |
110 | return 0; |
111 | }; |
112 | } |
113 | |
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114 | if(@checks == 0){ |
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115 | $self->{compiled_type_constraint} = $null_check; |
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116 | } |
117 | elsif(@checks == 1){ |
118 | my $c = $checks[0]; |
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119 | $self->{compiled_type_constraint} = sub{ |
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120 | my(@args) = @_; |
121 | local $_ = $args[0]; |
122 | return $c->(@args); |
123 | }; |
124 | } |
125 | else{ |
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126 | $self->{compiled_type_constraint} = sub{ |
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127 | my(@args) = @_; |
128 | local $_ = $args[0]; |
129 | foreach my $c(@checks){ |
130 | return undef if !$c->(@args); |
131 | } |
132 | return 1; |
133 | }; |
134 | } |
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135 | return; |
90fe520e |
136 | } |
137 | |
ffbbf459 |
138 | sub _add_type_coercions{ |
139 | my $self = shift; |
140 | |
141 | my $coercions = ($self->{_coercion_map} ||= []); |
142 | my %has = map{ $_->[0] => undef } @{$coercions}; |
143 | |
144 | for(my $i = 0; $i < @_; $i++){ |
145 | my $from = $_[ $i]; |
146 | my $action = $_[++$i]; |
147 | |
148 | if(exists $has{$from}){ |
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149 | Carp::confess("A coercion action already exists for '$from'"); |
ffbbf459 |
150 | } |
151 | |
152 | my $type = Mouse::Util::TypeConstraints::find_or_parse_type_constraint($from) |
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153 | or Carp::confess("Could not find the type constraint ($from) to coerce from"); |
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154 | |
155 | push @{$coercions}, [ $type => $action ]; |
156 | } |
157 | |
158 | # compile |
159 | if(exists $self->{type_constraints}){ # union type |
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160 | Carp::confess("Cannot add additional type coercions to Union types"); |
ffbbf459 |
161 | } |
162 | else{ |
163 | $self->{_compiled_type_coercion} = sub { |
164 | my($thing) = @_;\r |
165 | foreach my $pair (@{$coercions}) {\r |
166 | #my ($constraint, $converter) = @$pair;\r |
167 | if ($pair->[0]->check($thing)) {\r |
168 | local $_ = $thing; |
169 | return $pair->[1]->($thing); |
170 | }\r |
171 | }\r |
172 | return $thing;\r |
173 | }; |
174 | } |
175 | return; |
176 | } |
177 | |
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178 | sub check { |
179 | my $self = shift; |
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180 | return $self->_compiled_type_constraint->(@_); |
181 | } |
182 | |
183 | sub coerce { |
184 | my $self = shift; |
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185 | |
186 | return $_[0] if $self->_compiled_type_constraint->(@_); |
187 | |
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188 | my $coercion = $self->_compiled_type_coercion; |
189 | return $coercion ? $coercion->(@_) : $_[0]; |
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190 | } |
191 | |
192 | sub get_message { |
193 | my ($self, $value) = @_; |
194 | if ( my $msg = $self->message ) { |
195 | local $_ = $value; |
196 | return $msg->($value); |
197 | } |
198 | else { |
199 | $value = ( defined $value ? overload::StrVal($value) : 'undef' ); |
200 | return "Validation failed for '$self' failed with value $value"; |
201 | } |
202 | } |
203 | |
204 | sub is_a_type_of{ |
205 | my($self, $other) = @_; |
206 | |
207 | # ->is_a_type_of('__ANON__') is always false |
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208 | return 0 if !ref($other) && $other eq '__ANON__'; |
feb0e21b |
209 | |
210 | (my $other_name = $other) =~ s/\s+//g; |
211 | |
212 | return 1 if $self->name eq $other_name; |
213 | |
214 | if(exists $self->{type_constraints}){ # union |
215 | foreach my $type(@{$self->{type_constraints}}){ |
216 | return 1 if $type->name eq $other_name; |
217 | } |
218 | } |
219 | |
220 | for(my $parent = $self->parent; defined $parent; $parent = $parent->parent){ |
221 | return 1 if $parent->name eq $other_name; |
222 | } |
223 | |
224 | return 0; |
225 | } |
226 | |
227 | |
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228 | 1; |
229 | __END__ |
230 | |
231 | =head1 NAME |
232 | |
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233 | Mouse::Meta::TypeConstraint - The Mouse Type Constraint metaclass |
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234 | |
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235 | =head1 VERSION |
236 | |
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237 | This document describes Mouse version 0.40_01 |
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238 | |
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239 | =head1 DESCRIPTION |
240 | |
241 | For the most part, the only time you will ever encounter an |
242 | instance of this class is if you are doing some serious deep |
243 | introspection. This API should not be considered final, but |
244 | it is B<highly unlikely> that this will matter to a regular |
245 | Mouse user. |
246 | |
247 | Don't use this. |
248 | |
249 | =head1 METHODS |
250 | |
251 | =over 4 |
252 | |
253 | =item B<new> |
254 | |
255 | =item B<name> |
256 | |
257 | =back |
258 | |
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259 | =head1 SEE ALSO |
260 | |
261 | L<Moose::Meta::TypeConstraint> |
262 | |
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263 | =cut |
264 | |